[Metricbeat] gcp: fix integration tests

CHANGELOG-developer.next.asciidoc

@@ -124,3 +124,8 @@ The list below covers the major changes between 7.0.0-rc2 and master only.
 - Update Go version to 1.16.5. {issue}26182[26182] {pull}26186[26186]
 - Introduce `libbeat/beat.Beat.OutputConfigReloader` {pull}28048[28048]
 - Update Go version to 1.17.1. {pull}27543[27543]
+- Whitelist `GCP_*` environment variables in dev tools {pull}28364[28364]
+
+==== Deprecated
+
+- Deprecated the `common.Float` type. {issue}28279[28279] {pull}28280[28280]

dev-tools/mage/common.go

@@ -905,6 +905,7 @@ func IntegrationTestEnvVars() []string {
 	prefixes := []string{
 		"AWS_",
 		"AZURE_",
+		"GCP_",
 
 		// Accepted by terraform, but not by many clients, including Beats
 		"GOOGLE_",

x-pack/metricbeat/module/gcp/DEVELOPMENT.md

@@ -68,3 +68,10 @@ Run `make update` to update `fields.go` from each metricset `fields.yml`
 
 The implementation is within `metrics` metricset. That metricset allows other metricsets to use it
 as a "parent module" and implement the light-weigth module pattern.
+
+# Running integration tests
+
+Golang integration tests may be run with: `TEST_TAGS=gcp MODULE=gcp mage goIntegTest`
+
+This command will exclude `gcp.billing` metricset, as without access to a Billing Account it will always return an empty set of metrics.
+TODO: mock data so tests are not coupled with real GCP infrastructure.

x-pack/metricbeat/module/gcp/billing/billing_integration_test.go

@@ -2,8 +2,8 @@
 // or more contributor license agreements. Licensed under the Elastic License;
 // you may not use this file except in compliance with the Elastic License.
 
-//go:build integration && gcp
-// +build integration,gcp
+//go:build integration && gcp && billing
+// +build integration,gcp,billing
 
 package billing
 
@@ -21,8 +21,8 @@ func TestFetch(t *testing.T) {
 	config["period"] = "24h"
 	config["dataset_id"] = "master_gcp"
 
-	metricSet := mbtest.NewReportingMetricSetV2Error(t, config)
-	events, errs := mbtest.ReportingFetchV2Error(metricSet)
+	metricSet := mbtest.NewReportingMetricSetV2WithContext(t, config)
+	events, errs := mbtest.ReportingFetchV2WithContext(metricSet)
 	if len(errs) > 0 {
 		t.Fatalf("Expected 0 error, had %d. %v\n", len(errs), errs)
 	}